Trimming mechanism for machines for sewing looped fabrics



Oct. 19 1926.

G. KEYSER TRIMMING MECHANSM FOR MACHINES FOR SEWING LOOPED FABRICS 1 324 6 2 1 ..`UJ mi; mm2/g M .1 l a .MM 0 Q M W ML am MM .l 3 .`.n L o j..M mud 01 @www LIM T l x oo im 2 Filed Apri] 16,

Mv @C Oct. 19 1926.

lG. KEYSER TRIMMING MEGHANISM FOR MACHINES FOR-SEWING LOOED FABRICSFiled April 16, 1923 2 SheetS-Sheei 2 I 771/1217,v 71: (eorge Keyserscribed Vand claimed.

Patented Oct. 19, 1926.

entren STATES PATENT OFFECE.

GEORGE KEYSR, F PHILADELIiP'l-IJIAJ PENNSYLVANIA, ASSIGNOR TO JOHN W.HEP- W'ORTH t CO., OF PHILADELPHIA, PENNSYLVANIA, A CORPORATION OFPENNSYL- VANIA.

TRIMMING MECHANISM FOR MACHNES FOR SEWING LOOEED FABRICS.

Application filed April 16,

This invention relates to improvements in trimming mechanism formachines for sewing vlooped fabrics and has for its Yobject to provide anovel, simple and efficient construction and Vorganization of parts,first, whereby a cutting device may be operated by a rotating drivingshaftv to produce a plurality of cutting operations for each revolutionof the driving shaft; second, whereby the loose threads carried by theloops of. 'thread on the impaling lpins of the machine may be brushedtherefrom after the trimming or cutting operation; third, Vwhereby bodyportions ofthe fabrics accidentally impaled' upon the impaling pine withthe edge portions thereof desired to be trimmed may `be shed or removedtherefrom and thus prevented from reaching the cutting'device; fourth,whereby the edge portions of the fabrics to be trimmed impaled upon thepins may be alined with the cutting device as they advanced thereto;and, fifth, whereby the strips of fabrics cut by the cutting device fromthe fabrics carried by the pins may be shed or moved outwardly andthereby be *prevented Vfrom reaching the brushing` device.

Theinvention consists of the elements and the combinations of them.hereinafter de- 1n the accompanying drawings, illustrating my invention,

Figure lis a top Vview Iof a `portion of a machine for sewing looped-fabrics'provided with a trimming mechanism embodying my invention, partof the trimming lmechanism being shown in'section.

Figure '2 is a side view of the trimming mechanism and adjacent'partsofthe sewing machine.

Figure 3 is a vert-ical section of the parts Vshown in Fig. 2, on line3-3 of Fig. 2.

Referring to the drawings, the main frame of the looper or machine foruniting looped fabrics comprises a bed'plate 2 adapted to be securedupon a table or support, an Voverhanging arm 4: "rising from andextending outwardly from the bed plate 2, anda disc like head 5 carriedby a shaft 6 whichis secured to and extends downwardly from the arm 4l.

The main driving `shaft 7 `of'the machine is journaled in a suitablebearing 8 'formed 1923. Serial N0. 632,211.

by the arm 4l, and the shaft 7 is adapted to be driven from a Asuitablesource of power for thc actuation of the mechanism of the looper and forthe actuation of the trimming mechanism hereinafter described.

Surrounding the head 5 and rotatably yfitted to the periphery thereof isa ring 9 sup 60 ported by a ring plate 10 secured to the bottom of thehead. The ring 9 is provided with a circular'series ofradially-projecting impaling pins 1'1-for receiving the loops of theedge portions of the fabrics to be united and'supporting and advancingthem to kthe sewing mechanism of the looper (not shown) whicn sews .themtogether as they pass :the region 12. The ring 9 and therewith the inpaling pins 11 are rotated in the direction of 70 vthe arrow in Fig. 1to advance the impaled 'pins 11 to the sewing mechanism of the 85vlliooper.

`Secured upon the head 5, and forming, -in effect, apart of themainframe of the l'ooper, is av bracket 13 lcarrying a horizontalarm 111provided-with 'vertical limb 15. The limb 15 90 is fitted to slidevertically ina groove in the bracket 13 and itis secured thereto by ascrew 16 which extends through Ya slot in the limb 15 land which isscrewed into the bracket 13. The arm 1li carries a fixed cut- 95 tingblade 17 which `is seated in a` transverse i groove in the bottom ofthe'arm 1st and held in place'thereinby a head 1;8between which and thearm'l/ the blade 17 is clamped. The head 18v is formed on lthe lower endof a 100 clamping screw which extends upwardly through the arm llan'dhasa clamping head 19 -screwed on to the upper end thereof and adaptedwhen screwed down upon the Varm 14 to'draw the screw'upwardly"andthereby 105 c lamp'fthe `blade 117. The blade 1? is ranged above theimpaling pins 11 and it is provided with a` cutting edge 20. The blade1T may be adjusted vertically relatively to the pins 11 by loosening thescrew 16 and raising` or lowering the arm 14; and the blade 17 maybeadjusted radially with respect t0 the pins 11 by loosening the head 19and moving the blade 17 inwardly or outwardly.

Arranged above the blade 17 is a movable cutting blade 21 having acutting edge 22 adjacent to the cutting edge 2O of the blade .17, and aprojection 23 which extends inwardly over the blade 17. rhe blade 21 isseated in a transverse groeve in the bottom of an arin 24 and held inplace therein by a head 25 between which and the arm 24 the blade isclamped. The -head 25 is formed on the lower end of the clamping screwwhich extends upwardly through the arm and has a clamping head 26screwed on to the upper end thereof and adapted when screwed down uponthe arm 24 to draw the screw upwardly and thereby clamp the blade 21.The blade 21 may be adjusted radially with respect to the iinpaling pins11 by loosening the head 26 andinoving the blade 21. inwardly oroutwardly.

The blade carrying arm 24 is secured to and projects from a verticalshaft 27 which is fitted to turn and slide vertically in bearings formedby the bracket 13. rllhe shaft 27 extends below the bracket 13 and has ahead 28 on the lower end thereof. Encircling the shaft 27 between thehead 28 and bracket 13 is a spring 29 which exerts a downward pressureupon the shaft 27 and arm 24 carried thereby and presses the projection23 of the blade 21 upon the blade 17. When the shaft 27 is rocked backand forth,V as will be presently explained7 the cutting edge 22 of themovable blade y21 sweeps over the cutting edge 20 of the fixed blade 17in a manner to effect shearing actions and to cause the blades 17 and 21to work like the blades of a pair of scissors to cut or shear the edgeportions of fabrics passed between them. The engagement of theprojection 23 of the blade 21 with the top of the blade 17, and thepressure of the spring 29 maintain the cutting edges 2O and 22 in propershearing relation. l

The shaft 27 extends above the bracket 13 and has an arm 30 secured tothe upper end portion thereof and extending back over the impaling pins11 and connected by a balland-socket joint to one end of a pitman 31.rllhe other end of the pitman 31 is connected by a ball-and-socket jointto one arm 32 of a bell-crank lever 33 formed on or secured to arockable shaft 34 which is mounted to turn in a bearing in an arm 35which is supported in a manner hereinafter described. The other arm 86of the lever 33 is connected to a crank arm 37 on the driving shaft 7 ofthe looper by a rod 38 and two end blocks or members 39 and 40 which areadjustably secured to the rod 38 and pivotally con-- nected to the arms36 and 37, respectively. The parts connecting the main driving shaft 7of the looper and the vertical shaft 27 are so relatively arranged as tocause the shaft 27 to be rocked back and forth by the driving shaft 7when it is rotated, for the actuation of the blade 21 of the cuttingdevice, and to cause the pivotal connection between the lever arm 32 andpitinan 31 to move substantially the same distance above and below thehorizontal. center of the shaft 347 each time the driving shaft 7 isturned a. complete reifolution, thus exile-etui?)` a plurality or two'forward and back movements of the cutting blade 21 during eachrevolution of the driving sha t7.

The rockable shaft 34 extends out over thc iinpaling pins 11 and carriesa brush 41 comprising` a cylindrical body 12 secured to the shaft 34 andtwo parallel rows of radially projecting bristle tufts xtending aroundthe saine. rThe bristle tufts of the two rows thereof are arranged instaggered relation to each other, and the shaft 34 extends obliquelyacross the impaling pins 11 passing beneath the brush 11, "'oi a purposehereinafter described. rllhc brush 41 is arranged in rear of the cuttingblades 17 and 21 and the lower bristle tufts thereof are adapted tosweep back and forth over the trimmed edges of the fabrics carried bythe pins 11 when the shaft 84 is rocked.

The brush V41 is secured to the shaft by having the cylindrical body 42thereof clamped betweena thumb nut 43 screwed on to the shaft 34 and awasher 44 resting against a shoulder portion of the shaft 34. Byloosening the nut 43 and turning the brush 41 the same may be adjustedcir-:ularly upon the shaft $34 for any purpose and for bringing freshbristle tufts thereof into play upon the impaling pins 11 after activebristle tufts have become worn.

r1`he arm 35 carrying` the shaft which carries the brush 41 projectsfixedly from a shaft 45 fitted to turn in bearings on the bracket 13.The outer end portion of the shaft 45 has an arm 46 secured thereonhaving a slot in the free end portion thereof through which passes ascrew 47. The screw 47 is screwed into the bracket 13 and is providedwith a head 1S fixed tlereon and engaging the arm 46. The arm 416 isheld against the head 48 by a spil y whichencircles the screw 47 betweenthe bracket 13 and a collar on the screw 47 and engaging the arm 46. Itwill now be understood that when the screw head 48 is turned forward andback the shaft 45 will berocked, and that when the shaft l5 rocked, theAarm 85 and brush 41 carried thereby4 will be raised and lowered.purpose of providing the means to raise or un 4Q lll) lower the brush 11is to adjust thesameinto proper working vrelation to fthe limpaling pins11.

Extending longitudinally between the arms 14 and 2st carrying the blades17 and 21 of the cutting device is a plate 50 having an arm 51 extendingover the movable blade carrying arm 24 and adjustably secured thereto bya screw 52. The plate `isarranged in close proximity to the impalingpins 11 and the end thereof in advance Yof the cutting blades 17 'and 21is provided with a proj ection 53 which extends forwardly therefrom orin the direct-ion of the approach `of the pins 11to the blades 17 and 21and which is turned upwardly from the body of the plate 50 to form ashedding device to shed accidentally impaled portions of fabrics fromthe pins 11, as will presently appear.

The body of the plate 50, between the projection 53 Vand blades 17 and21, is provided with an inwardly extending portion 54 having adownwardly turned edge portionextending close to the path of theimpaling pins 11 for beating up the impaled edges of the fabrics carriedby the pins into close relationship with the ring 9 and into alinementwith the space between the cutting edges 2() and 22 to enter the same.

The rearwardly extending Igend portion of the plate 50 is locatedrearwardly ofthe blades 17 and 21 and is moved back and forth over thepins 11 bythe arm 24and forms a shedding device to receive and shed fromthe pins 11 the strips of fabrics cut by the blades 17 and 21 from thefabrics carried by the pins.

The arm lfixed to the bracket 13 supports aguard plate55 which extendsfrom its forward end 56 in advance ofthe shedding projection 53inwardlybf the periphery of the pin carrying ring 9 until `it passes thecutting blades 17 and 21. ,The guard plate 55 is gradually curved`outwardly to a point beyond the impaling pins 11 from the blades 17 and21 to the end 57 of the plate 55. The purpose of the guard plate 55 isto prevent the edge portions of the fabrics carried by and extendingabove the pins 11 from falling inwardly over the ring 9 and to directthe strips of fabrics cut from the fra-bries carried by the pins 11outwardly beyond the free ends of the pins. rEhe guardplate 55 issecured to'the arm 1L1 by means of a screw 58 which extends through anarm 59 formed on and projecting from the plate 55.

The brush 4.1 is housed within a projecting guard 60 supported by anarml which is secured to and extends outwardly fromthe bracket 13. VTheguard 60 supports a guard plate 62 which is arranged beneath the pathofthe impaling pins 11 and which extends outwardlyfrom-the freegendsofthe pins 1,1,

tuate the sewing` mechanism of the looper' and to turn the ring 9carrying the im- `paling pins 11vin the direction of the arrow in Fig.`1, inthe usual manner; and, as the drivingshaft 7 is rotated, the brush11 ,and

`cutting blade 21 are actuated as previously explained.

The looped fabrics to be united are `iin- -paled by hand upon the .pins11 forwardly of the plate 50 with the. pins 11 extending throughindividual loops of the fabrics and with edge portions of the yfabricsto be trimmed extending above the pins 11; and when here-in I speak offorwardly or forward 1 mean in the direction opposite to that indicatedby the `arrow in Fig. v1.

As the impaled fabrics are moved bythe pins 11 toward the sewing region12, they l pass between the periphery ofthe ring 9 .andthe plate 5() andbetween the cutting ,edges 2() and 22 of the blades 17 and 21,

when theblade 21 is in the. position shown vin Fig. 1; and, as thecutting edge 22 is vmoved rapidly across the cutting edge 20, the

edge portions of the fabrics passing above the cutting edges 20 and 22are cut or severed thereby v`from thebody portions of the fabricsdirectly above theloops of the fabrics .throu h which the pins 11carrying them extenc, 4leaving U-shaped portions of .cut loops withinthe loops upon the pins 11 and within the usual needlegrooves in thetops of the pins 11. Y i

Y As theimpaled fabrics pass the outwardly and inwardly moving sheddingprojecting .531t engages and shedsfrom the free ends of the pins anyparts ofthe bodies of the fabrics which are accidentally impaled uponthe pins outwardly of the edgeportions of` vfabrics purposely impaledvfor trimming pur- 1 poses and prevents theaccidentally impaled portionsfrom v.reaching the cutting edges 20 and 22.

As the impaled edge portions of the fabrics pass the downwardly turnededge portion k54v of the plate 50 the edge portion 54 beats the edgeportions of the fabrics up toward the ring 9 and vinto alinement withthe blades 17 and 21 or the space between the cutting edges 2O and 22 toensure their entrance into the sanietobe cut or severed by the blades.

' its the edgeportions of the inipaledffabrics extendingabove thecutting edges of .lill

cut or severed from the body por ions of the fabrics and they aredirected outwardly beyond the free ends of the pins ll by the guard 55and shedding device 50 and outer edge of the l 63, the several edgeportions hanging own aga-inst 'the outer et "es of the plates 5() andG12 and being;v t erebyr prevented from being` eng: fred v the free endsof the pins ll, and finally from the machine, while the trimmed edgeportions the fabrics are carried on to the sewing region l2 by the pins1l..

As the trimmed edge portions of the fabrics carried by the pins 1l passbeneath the brush ll to ex'tei'id obliqiieiy across the inipaling` pinsl1 passing beneath the brush causes the bottom or eifeg-tive'poi tiono-f the brush to sweep bai'lr and forth obliquely across the impaiingpins, and that this, assisted by the staggered relation of the bristletufts of the brush Lll works the fabric loops impaled upon the pins inand out radially thereon and eifectualiy works out from within theimpaled loops the said U-shaped portions of cut loops 'which remaintherein following the cuttings; opera tion, and which are diflicult todislodge; and l have also discovered that the timingof the operation ofthe cutting blade 2l to produce a plurality of in andout motions thereoffor each forward and back motion ofthe active bristle tufts of the brushll results in a clean and sharp cutting operation followed by a thoroughremoval of all waste parts of the cut fabrics fromthe impaled fabricloops, so that they will be present-ed to the sewing mechanism free fromall lint and waste.

l. The combination of a 'supporting frame, a rotatable ringcarryingimpaling` pins, a fixed cutting blade. a movable cutting; blade adaptedwhen moved inwardly and outwardly to co-operate with the fixed blade totrim the edges of fabrics carried by the pins a rotatable driving`shaft, and means operated by the shaft when rotated to move the movableblade inwardly and outwardly a plurality of times during each revolutionof the shaft.

2. The combination of .a 'supporting frame` a rotatable ring carryingiinpaling` pins a rotatable drivingl shaft, a rockable shaft having anarm projectinglv therefrom. means operated by the driving shaft to movethe rockable shaft forward and back dropping tally arranged r'oclrablelshaft during each revolution of the driving shaft7 a second rockableshaft having an arm projecting therefrom, a pitman connecting said armsand passing the center of the first named rochablo shaft during eachinward and each outward movement thereof to effeet two inward andoutward movements of the second named roi-hable shaft for each forwardand back movement of the .tirst named rockable shaft, and a cutting`device operated 4by the second named rockable shaft to trim the edges offabrics carried bythe impaling pins.

The combination of a supporting framet a rotatable mg carrying impalingpins. a rotatable driving' shaft, a rockable shaft having; an armprojecting therefrom,

means operated by the driving shaft to move the rockable shaft forwardand back during; each revolution of the or viirj shaft,

'a second rockable shaft having an arm proyjecting thererronr a pitinanconnecting' said arms and passing' the center of the first namedrockable shaft during' each inward and cach outward movement thereof tocffecit 'tw-:i inv-.iard and outward movements of tl; cond namedroekable shaftfor each vforwm d and back movement of the rst namedrock-able shaft, a cutting),` device operated by the :ond named roclmbleshaft to trim' the edges of fabrics carried by the iinpaling pins and abrush associated with the first naniied ioclable shaft and adaoted to beoperated thereby to brush the trimmed edges of the fabrics carried bysaid pins 4:. The combination of a supportingv frame, a rotatable ringcarrying; impaling` pins, a rotatable dri ne shaft, a horizonhaving; anarm extendingtherefrom, means operated by the drivingr shaft to move therroclrable shaft forward and back during each revolir tion of thedriving-j shaft, a vertic-fihv arranged ioclzable shaft havinfr antending th-erefroim a pitman c f arms and passingiA the c AAe firstnamed rookable shaft du*n each inward and cach ,outward movement thereofto effeet two inward and outward mi ofthe second named rot each forwardand back g first named rockable shaftA and i: device for trimmingv theof carried by the impalino,` pins and comp b a fixed blade supported b vthe frame and a movable blade carried by the vertically arranged shaft.

5. The combination of a supporting frame, a rotatable ring carryino'impaling pins, a rotatable driving shaft, a horizontally arranged,roolable shaft having` an arm extending therefrom, vmeans operated bythe driving shaft to move the roclable shaf t forwardand bach duringaeach revolution rockable shaft having an arm extending therefrom, apitman connecting said arms and passing the center of the first namedrockable shaft during each inward and each outward movement thereof toeffect two inward and outward movements of the second named ioclrableshaft for each forward and back movement of the first named rockableshaft, a cutting device for trimming the edges of fabrics carried by theimpaling pins and comprising a fixed blade supported by the frame and amovable blade carried by the vertically arranged shaft, and a brushassociated with the horizontally arranged, rockable shaft and adapted tobe operated thereby to brush the trimmed edges of the fabrics carried bythe impaling pins.

6. The combination of a supporting frame, a rotatable ring carryingimpaling pins, a rotatable driving shaft, a supporting member pivotallyconnected to the frame, a horizontally arranged, rockable shaftl carriedby the member and having an arm extending therefrom, a brush carried bythe rockable shaft and adapted to be operated thereby to brush thetrimmed edges of fabrics carried by the impaling pins, means operable toadjust said member on its pivot to change the relation of the brush andthe pins, means operated by the driving shaft to move the rockable shaftforward and bach during each revolution of the driving shaft, a secondrockable shaft having an arm projecting therefrom, a pitman connectingsaid arms and passing the center of the first named rockable shaftduring each inward and each outward movement thereof to edect two inwardand outward movements of the second named rockable shaft for eachforward and back movement of the first named rockable shaft, and acutting device operated by the second named rockable shaft to trim theedges of fabrics carried by the impaling pins.

7. The combination of a supporting frame, a. rotatable ring carryingradially eX- tending impaling pins, a brush mounted to oscillate abovethe pins on an axis which extends obliquely across the impaling pinspassing beneath the brush, and means operable to oscillate the brush.

S. rlhe combination of a supporting frame, a rotatable ring carryingimpaling pins, a cutting device to trim the edges of fabrics carried bythe impaling pins, a shedding device movable in advance of the cuttingdevices to shed from the pins body portions of fabrics accidentallyimpaled upon the pins with the edge portions thereof desired to betrimmed, and means operable to actuate the cut-ting device and theshedding device.

9. The combination of a supporting frame, a rotatable ring carryingimpaling pins, a fixed cutting blade, a movable arm, a cutting bladecarried by said arm and adapted to co-operate with the fixed blade totrim the edges of fabrics carried by the pins, a shedding device carriedby said arm in advance of the blades to shed from the pins body portionsof fabrics accidentally impaled upon the pins with the edge portionsthereof desired to be trimmed, and means operable to actuate the arm andthereby actuate the blade and shedding device carried thereby.

l0. The combination of a supporting frame, a rotatable ring carryingimpaling pins, a fixed cutting blade, a movable arm, a cutting bladecarried by said arm and adapted to co-operate with the fixed blade totrim the edges of fabrics carried by the pins, a plate carried by saidarm above the impaling pins and having a projection form ing a sheddingdevice in advance of and spaced from the blades to shed from the pinsportions of the fabrics accidentally impaled thereon, said plate havinga downwardly turned edge portion between the shedding device and theblades forming a beater for beating up the impaled edges of the fabricsinto alinement with the cutting blades, and means operable to actuatethe arm and the plate and blade carried thereby.

11. The combination of a supporting frame, a rotatable ring carryingimpaling pins, a fixed cutting blade, a movable arm, a cutting bladecarried by said arm and adapted to co-operate with the fixed blade totrim the edges of fabrics carried by the pins, a plate carried by saidarm above the inipaling pins and having a projection forming a sheddingdevice in advance of and spaced from the blades to shed from the pinsportions of the fabrics accidentally impaled thereon, said plate havinga downwardly turned edge portion between the shedding device and theblades forming a beater for beating up the impaled edges of the fabricsinto alinement with the cutting blades, and said plate having a partextending over the impaling pins rearwardly from the blades to shed fromthe pins the strips of fabrics cut by the blades from the fabricscarried by the pins, and means operable to actuate the arm of the plateand blade carried thereby.

In testimony whereof I affix my signature hereto.

GEORGE Kersen.

gli

